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US11277558B2 - Vehicle vision system with master-slave camera configuration - Google Patents

Vehicle vision system with master-slave camera configuration Download PDF

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Publication number
US11277558B2
US11277558B2 US15/420,239 US201715420239A US11277558B2 US 11277558 B2 US11277558 B2 US 11277558B2 US 201715420239 A US201715420239 A US 201715420239A US 11277558 B2 US11277558 B2 US 11277558B2
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Prior art keywords
image data
camera
slave
cameras
master camera
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US15/420,239
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US20170223269A1 (en
Inventor
Sebastian FLUEGEL
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Magna Electronics Inc
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Magna Electronics Inc
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Priority to US15/420,239 priority Critical patent/US11277558B2/en
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Priority to US17/654,604 priority patent/US20220210324A1/en
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Definitions

  • the present invention relates generally to a vehicle vision system for a vehicle and, more particularly, to a vehicle vision system that utilizes two or more cameras at a vehicle.
  • the present invention provides a driver assistance system or vision system or imaging system for a vehicle that utilizes two or more cameras (preferably two or more CMOS cameras) to capture image data representative of images exterior of the vehicle, with one of the cameras comprising a master camera and at least one other of the cameras comprising a slave camera.
  • the master camera includes a view generator and combines image data captured by the master camera with image data signals of the slave camera(s) to generate an image for display at a display of the vehicle.
  • the master camera includes aspects of a control unit, whereby the vision system eliminates the need of a separate control unit.
  • a vision system of a vehicle includes a plurality of cameras configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle.
  • a display device is operable to display images for viewing by a driver of the vehicle.
  • Each of the plurality of cameras captures image data.
  • the plurality of cameras comprises a master camera and at least one (such as three or five) slave camera, which communicates a signal to the master slave camera representative of image data captured by the at least one slave camera.
  • the master camera comprises an image signal processor for processing image data captured by at least the master camera.
  • the master camera comprises a view generator operable to generate images (derived from image data captured by the master camera and the at least one slave camera) for display by said display device.
  • FIG. 1 is a plan view of a vehicle with a vision system that incorporates cameras in accordance with the present invention
  • FIG. 2 is a schematic of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via compressed Ethernet;
  • FIG. 3 is a schematic of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via NTSC;
  • FIG. 4 is a schematic of a vision system having a master camera and at least three slave cameras in accordance with the present invention
  • FIG. 5 is a schematic of another vision system having a master camera and at least three slave cameras in accordance with the present invention.
  • FIG. 6 is a schematic of a vision system having a master camera and at least five slave cameras in accordance with the present invention.
  • a vehicle vision system and/or driver assist system and/or object detection system and/or alert system operates to capture images exterior of the vehicle and may process the captured image data to display images and to detect objects at or near the vehicle and in the predicted path of the vehicle, such as to assist a driver of the vehicle in maneuvering the vehicle in a rearward direction.
  • the vision system includes an image processor or image processing system that is operable to receive image data from one or more cameras and provide an output to a display device for displaying images representative of the captured image data.
  • the vision system may provide display, such as a rearview display or a top down or bird's eye or surround view display or the like.
  • a vehicle 10 includes an imaging system or vision system 12 that includes at least one exterior facing imaging sensor or camera, such as a rearward facing imaging sensor or camera 14 a (and the system may optionally include multiple exterior facing imaging sensors or cameras, such as a forwardly facing camera 14 b at the front (or at the windshield) of the vehicle, and a sidewardly/rearwardly facing camera 14 c , 14 d at respective sides of the vehicle), which captures images exterior of the vehicle, with the camera having a lens for focusing images at or onto an imaging array or imaging plane or imager of the camera ( FIG. 1 ).
  • an imaging system or vision system 12 that includes at least one exterior facing imaging sensor or camera, such as a rearward facing imaging sensor or camera 14 a (and the system may optionally include multiple exterior facing imaging sensors or cameras, such as a forwardly facing camera 14 b at the front (or at the windshield) of the vehicle, and a sidewardly/rearwardly facing camera 14 c , 14 d at respective sides of the vehicle), which captures images
  • a forward viewing camera may be disposed at the windshield of the vehicle and view through the windshield and forward of the vehicle, such as for a machine vision system (such as for traffic sign recognition, headlamp control, pedestrian detection, collision avoidance, lane marker detection and/or the like).
  • the vision system 12 includes a control or electronic control unit (ECU) or processor 18 that is operable to process image data captured by the camera or cameras and may detect objects or the like and/or provide displayed images at a display device 16 for viewing by the driver of the vehicle (although shown in FIG. 1 as being part of or incorporated in or at an interior rearview mirror assembly 20 of the vehicle, the control and/or the display device may be disposed elsewhere at or in the vehicle).
  • the data transfer or signal communication from the camera to the ECU may comprise any suitable data or communication link, such as a vehicle network bus or the like of the equipped vehicle.
  • a common solution in surround view/top view/bird's eye view vehicle systems (SVS) that have cameras with Ethernet based data transmissions typically employs a main ECU receiving the data from the cameras, which then typically generates the desired view such as the bird's eye top view or another selected view such as, for example, a reverse directed view (rear view) or the like.
  • the display is attached to the ECU for presenting the selected or generated view to the vehicle occupants.
  • the display device typically receives the image to view via analog NTSC or digitally, often serialized via APIX, or via a LVDS line.
  • the display device may be connected via another Ethernet line or link. Due to limited bandwidth for transferring high resolution images, the vision data often becomes compressed via a compression codec. In automotive applications, Mjpg and H.264 have been established, and soon there may be a new H.265 compression standard.
  • the data of every camera needs to be decompressed in the ECU for further processing (image signal processing done by an image signal processor or ISP) and for view generation before the resulting video image is compressed for being transferred to a display device, when the display device is attached via Ethernet.
  • Typical view generation function blocks are view warping, image stitching, blending and overlay generation, optionally under consideration of specific mapping tables for specific artificial views or perspectives such as views differing from vertically top down or other parameters.
  • the ISP typically comprises Debayering, HDR Tone mapping and image enhancement such as de-noising. Additional algorithms such as camera calibration, camera synchronization, object detection and/or the like may be processed as well by the ECU.
  • FIG. 2 An example of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via compressed Ethernet is shown in FIG. 2 .
  • FIG. 3 An example of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via NTSC is shown in FIG. 3 .
  • the present invention provides a vision system that provides or includes the ECU functionality in one of the cameras as a master camera, sparing the ECU device instead.
  • the non-master cameras are referred to herein as slave cameras.
  • the slave cameras may stay identically (compare to conventional SVS Ethernet cameras) or optionally may comprise an additional image signal processor (ISP), by that the ISP will be done on each slave camera and for the image captured by the master camera on the master camera, such as shown in FIGS. 4 and 5 .
  • the master camera includes a decryptor that decrypts the image data of three slave cameras (that has been encrypted by the respective slave camera after image signal processing and before communication to the master camera) and generates a view out of these three slave image signals and its own captured image signal.
  • the master camera decrypts the encrypted data received from five slave cameras and generates a view out of these five slave images signal and its own captured image signal, such as shown in FIG. 6 .
  • the master camera may require a larger space due to holding more components and having more connectors.
  • the camera with the most space freedom can be selected to be the master (for example, the master camera may be selected to be a forward viewing camera at a forward portion of the vehicle, a rearward viewing camera at a rearward portion of the vehicle, a driver-side viewing camera at a driver-side portion (such as at an exterior driver-side rearview mirror) of the vehicle, or a passenger-side viewing camera at a passenger-side portion (such as at an exterior passenger-side rearview mirror) of the vehicle.
  • an architecture with the least common data line length for connections with the master camera is preferred.
  • the master-slave camera configuration of the present invention may utilize aspects of the systems described in U.S. Publication No. US-2014-0327774 and/or U.S. patent application Ser. No. 15/334,365, filed Oct. 26, 2016, which are hereby incorporated herein by reference in their entireties.
  • the cameras or sensors may comprise any suitable camera or sensor.
  • the camera may comprise a “smart camera” that includes the imaging sensor array and associated circuitry and image processing circuitry and electrical connectors and the like as part of a camera module, such as by utilizing aspects of the vision systems described in International Publication Nos. WO 2013/081984 and/or WO 2013/081985, which are hereby incorporated herein by reference in their entireties.
  • the system includes an image processor operable to process image data captured by the camera or cameras, such as for detecting objects or other vehicles or pedestrians or the like in the field of view of one or more of the cameras.
  • the image processor may comprise an image processing chip selected from the EyeQ family of image processing chips available from Mobileye Vision Technologies Ltd. of Jerusalem, Israel, and may include object detection software (such as the types described in U.S. Pat. Nos. 7,855,755; 7,720,580 and/or 7,038,577, which are hereby incorporated herein by reference in their entireties), and may analyze image data to detect vehicles and/or other objects.
  • the system may generate an alert to the driver of the vehicle and/or may generate an overlay at the displayed image to highlight or enhance display of the detected object or vehicle, in order to enhance the driver's awareness of the detected object or vehicle or hazardous condition during a driving maneuver of the equipped vehicle.
  • the vehicle may include any type of sensor or sensors, such as imaging sensors or radar sensors or lidar sensors or ladar sensors or ultrasonic sensors or the like.
  • the imaging sensor or camera may capture image data for image processing and may comprise any suitable camera or sensing device, such as, for example, a two dimensional array of a plurality of photosensor elements arranged in at least 640 columns and 480 rows (at least a 640 ⁇ 480 imaging array, such as a megapixel imaging array or the like), with a respective lens focusing images onto respective portions of the array.
  • the photosensor array may comprise a plurality of photosensor elements arranged in a photosensor array having rows and columns.
  • the imaging array has at least 300,000 photosensor elements or pixels, more preferably at least 500,000 photosensor elements or pixels and more preferably at least 1 million photosensor elements or pixels.
  • the imaging array may capture color image data, such as via spectral filtering at the array, such as via an RGB (red, green and blue) filter or via a red/red complement filter or such as via an RCC (red, clear, clear) filter or the like.
  • the logic and control circuit of the imaging sensor may function in any known manner, and the image processing and algorithmic processing may comprise any suitable means for processing the images and/or image data.
  • the vision system and/or processing and/or camera and/or circuitry may utilize aspects described in U.S. Publication No. US-2014-0327774 and/or U.S. Pat. Nos. 8,694,224; 7,005,974; 5,760,962; 5,877,897; 5,796,094; 5,949,331; 6,302,545; 6,396,397; 6,498,620; 6,523,964; 6,611,202; 6,201,642; 6,690,268; 6,717,610; 6,757,109; 6,802,617; 6,806,452; 6,822,563; 6,891,563; 6,946,978; 7,859,565; 5,550,677; 5,670,935; 7,881,496; 7,720,580; 7,038,577; 6,882,287; 5,929,786 and/or 5,786,772, and/or International Publication Nos.
  • the system may communicate with other communication systems via any suitable means, such as by utilizing aspects of the systems described in International Publication Nos. WO/2010/144900; WO 2013/043661 and/or WO 2013/081985, and/or U.S. Publication No. US-2012-0062743, which are hereby incorporated herein by reference in their entireties.
  • the vision system may include a display for displaying images captured by one or more of the imaging sensors for viewing by the driver of the vehicle while the driver is normally operating the vehicle.
  • the vision system may include a video display device disposed at or in the interior rearview mirror assembly of the vehicle, such as by utilizing aspects of the video mirror display systems described in U.S. Pat. No. 6,690,268 and/or U.S. Publication No. US-2012-0162427, which are hereby incorporated herein by reference in their entireties.
  • the video mirror display may comprise any suitable devices and systems and optionally may utilize aspects of the compass display systems described in U.S. Pat. Nos.
  • the video mirror display screen or device may be operable to display images captured by a rearward viewing camera of the vehicle during a reversing maneuver of the vehicle (such as responsive to the vehicle gear actuator being placed in a reverse gear position or the like) to assist the driver in backing up the vehicle, and optionally may be operable to display the compass heading or directional heading character or icon when the vehicle is not undertaking a reversing maneuver, such as when the vehicle is being driven in a forward direction along a road (such as by utilizing aspects of the display system described in International Publication No. WO 2012/051500, which is hereby incorporated herein by reference in its entirety).
  • the vision system (utilizing the forward facing camera and a rearward facing camera and other cameras disposed at the vehicle with exterior fields of view) may be part of or may provide a display of a top-down view or birds-eye view system of the vehicle or a surround view at the vehicle, such as by utilizing aspects of the vision systems described in International Publication Nos. WO 2010/099416; WO 2011/028686; WO 2012/075250; WO 2013/019795; WO 2012/075250; WO 2012/145822; WO 2013/081985; WO 2013/086249 and/or WO 2013/109869, and/or U.S. Publication No. US-2012-0162427, which are hereby incorporated herein by reference in their entireties.

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Abstract

A vision system of a vehicle includes a plurality of cameras disposed at a vehicle and having a field of view exterior of the vehicle. A display device is operable to display images for viewing by a driver of the vehicle. The plurality of cameras includes a master camera and at least one slave camera. The at least one slave camera communicates a signal to the master slave camera representative of image data captured by the at least one slave camera. The master camera includes an image signal processor for processing image data captured by at least the master camera. The master camera includes a view generator operable to generate images for display by the display device, with the generated images derived from image data captured by the master camera and the signal communicated by the at least one slave camera.

Description

CROSS REFERENCE TO RELATED APPLICATION
The present application claims the filing benefits of U.S. provisional application Ser. No. 62/289,442, filed Feb. 1, 2016, which is hereby incorporated herein by reference in its entirety.
FIELD OF THE INVENTION
The present invention relates generally to a vehicle vision system for a vehicle and, more particularly, to a vehicle vision system that utilizes two or more cameras at a vehicle.
BACKGROUND OF THE INVENTION
Use of imaging sensors in vehicle imaging systems is common and known. Examples of such known systems are described in U.S. Pat. Nos. 5,949,331; 5,670,935 and/or 5,550,677, which are hereby incorporated herein by reference in their entireties.
SUMMARY OF THE INVENTION
The present invention provides a driver assistance system or vision system or imaging system for a vehicle that utilizes two or more cameras (preferably two or more CMOS cameras) to capture image data representative of images exterior of the vehicle, with one of the cameras comprising a master camera and at least one other of the cameras comprising a slave camera. The master camera includes a view generator and combines image data captured by the master camera with image data signals of the slave camera(s) to generate an image for display at a display of the vehicle. Thus, the master camera includes aspects of a control unit, whereby the vision system eliminates the need of a separate control unit.
According to an aspect of the present invention, a vision system of a vehicle includes a plurality of cameras configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle. A display device is operable to display images for viewing by a driver of the vehicle. Each of the plurality of cameras captures image data. The plurality of cameras comprises a master camera and at least one (such as three or five) slave camera, which communicates a signal to the master slave camera representative of image data captured by the at least one slave camera. The master camera comprises an image signal processor for processing image data captured by at least the master camera. The master camera comprises a view generator operable to generate images (derived from image data captured by the master camera and the at least one slave camera) for display by said display device.
These and other objects, advantages, purposes and features of the present invention will become apparent upon review of the following specification in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a vehicle with a vision system that incorporates cameras in accordance with the present invention;
FIG. 2 is a schematic of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via compressed Ethernet;
FIG. 3 is a schematic of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via NTSC;
FIG. 4 is a schematic of a vision system having a master camera and at least three slave cameras in accordance with the present invention;
FIG. 5 is a schematic of another vision system having a master camera and at least three slave cameras in accordance with the present invention; and
FIG. 6 is a schematic of a vision system having a master camera and at least five slave cameras in accordance with the present invention.
 DESCRIPTION OF THE PREFERRED EMBODIMENTS
A vehicle vision system and/or driver assist system and/or object detection system and/or alert system operates to capture images exterior of the vehicle and may process the captured image data to display images and to detect objects at or near the vehicle and in the predicted path of the vehicle, such as to assist a driver of the vehicle in maneuvering the vehicle in a rearward direction. The vision system includes an image processor or image processing system that is operable to receive image data from one or more cameras and provide an output to a display device for displaying images representative of the captured image data. Optionally, the vision system may provide display, such as a rearview display or a top down or bird's eye or surround view display or the like.
Referring now to the drawings and the illustrative embodiments depicted therein, a vehicle 10 includes an imaging system or vision system 12 that includes at least one exterior facing imaging sensor or camera, such as a rearward facing imaging sensor or camera 14 a (and the system may optionally include multiple exterior facing imaging sensors or cameras, such as a forwardly facing camera 14 b at the front (or at the windshield) of the vehicle, and a sidewardly/rearwardly facing camera 14 c, 14 d at respective sides of the vehicle), which captures images exterior of the vehicle, with the camera having a lens for focusing images at or onto an imaging array or imaging plane or imager of the camera (FIG. 1). Optionally, a forward viewing camera may be disposed at the windshield of the vehicle and view through the windshield and forward of the vehicle, such as for a machine vision system (such as for traffic sign recognition, headlamp control, pedestrian detection, collision avoidance, lane marker detection and/or the like). The vision system 12 includes a control or electronic control unit (ECU) or processor 18 that is operable to process image data captured by the camera or cameras and may detect objects or the like and/or provide displayed images at a display device 16 for viewing by the driver of the vehicle (although shown in FIG. 1 as being part of or incorporated in or at an interior rearview mirror assembly 20 of the vehicle, the control and/or the display device may be disposed elsewhere at or in the vehicle). The data transfer or signal communication from the camera to the ECU may comprise any suitable data or communication link, such as a vehicle network bus or the like of the equipped vehicle.
A common solution in surround view/top view/bird's eye view vehicle systems (SVS) that have cameras with Ethernet based data transmissions typically employs a main ECU receiving the data from the cameras, which then typically generates the desired view such as the bird's eye top view or another selected view such as, for example, a reverse directed view (rear view) or the like. Typically, the display is attached to the ECU for presenting the selected or generated view to the vehicle occupants. The display device typically receives the image to view via analog NTSC or digitally, often serialized via APIX, or via a LVDS line. Optionally, the display device may be connected via another Ethernet line or link. Due to limited bandwidth for transferring high resolution images, the vision data often becomes compressed via a compression codec. In automotive applications, Mjpg and H.264 have been established, and soon there may be a new H.265 compression standard.
When transferring compressed camera video data via Ethernet to an ECU, the data of every camera needs to be decompressed in the ECU for further processing (image signal processing done by an image signal processor or ISP) and for view generation before the resulting video image is compressed for being transferred to a display device, when the display device is attached via Ethernet. Typical view generation function blocks are view warping, image stitching, blending and overlay generation, optionally under consideration of specific mapping tables for specific artificial views or perspectives such as views differing from vertically top down or other parameters. The ISP typically comprises Debayering, HDR Tone mapping and image enhancement such as de-noising. Additional algorithms such as camera calibration, camera synchronization, object detection and/or the like may be processed as well by the ECU.
An example of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via compressed Ethernet is shown in FIG. 2. And an example of an image chain configuration of a typical four camera compressed Ethernet SVS and a display connected via NTSC is shown in FIG. 3.
The present invention provides a vision system that provides or includes the ECU functionality in one of the cameras as a master camera, sparing the ECU device instead. The non-master cameras are referred to herein as slave cameras. The slave cameras may stay identically (compare to conventional SVS Ethernet cameras) or optionally may comprise an additional image signal processor (ISP), by that the ISP will be done on each slave camera and for the image captured by the master camera on the master camera, such as shown in FIGS. 4 and 5. On a four camera SVS, the master camera includes a decryptor that decrypts the image data of three slave cameras (that has been encrypted by the respective slave camera after image signal processing and before communication to the master camera) and generates a view out of these three slave image signals and its own captured image signal.
On a six camera SVS, the master camera decrypts the encrypted data received from five slave cameras and generates a view out of these five slave images signal and its own captured image signal, such as shown in FIG. 6. For every configuration, having one master camera instead of an ECU and at least one slave camera, one pair of Ethernet PHYs, one decryption block, and one encryption block can be spared, which reduces system costs and enhances the image quality. The master camera may require a larger space due to holding more components and having more connectors. Because the choice is free as to which of the four (or more or less) cameras will be the master camera, the camera with the most space freedom can be selected to be the master (for example, the master camera may be selected to be a forward viewing camera at a forward portion of the vehicle, a rearward viewing camera at a rearward portion of the vehicle, a driver-side viewing camera at a driver-side portion (such as at an exterior driver-side rearview mirror) of the vehicle, or a passenger-side viewing camera at a passenger-side portion (such as at an exterior passenger-side rearview mirror) of the vehicle. Signal-wise, an architecture with the least common data line length (for connections with the master camera) is preferred.
The master-slave camera configuration of the present invention may utilize aspects of the systems described in U.S. Publication No. US-2014-0327774 and/or U.S. patent application Ser. No. 15/334,365, filed Oct. 26, 2016, which are hereby incorporated herein by reference in their entireties.
The cameras or sensors may comprise any suitable camera or sensor. Optionally, the camera may comprise a “smart camera” that includes the imaging sensor array and associated circuitry and image processing circuitry and electrical connectors and the like as part of a camera module, such as by utilizing aspects of the vision systems described in International Publication Nos. WO 2013/081984 and/or WO 2013/081985, which are hereby incorporated herein by reference in their entireties.
The system includes an image processor operable to process image data captured by the camera or cameras, such as for detecting objects or other vehicles or pedestrians or the like in the field of view of one or more of the cameras. For example, the image processor may comprise an image processing chip selected from the EyeQ family of image processing chips available from Mobileye Vision Technologies Ltd. of Jerusalem, Israel, and may include object detection software (such as the types described in U.S. Pat. Nos. 7,855,755; 7,720,580 and/or 7,038,577, which are hereby incorporated herein by reference in their entireties), and may analyze image data to detect vehicles and/or other objects. Responsive to such image processing, and when an object or other vehicle is detected, the system may generate an alert to the driver of the vehicle and/or may generate an overlay at the displayed image to highlight or enhance display of the detected object or vehicle, in order to enhance the driver's awareness of the detected object or vehicle or hazardous condition during a driving maneuver of the equipped vehicle.
The vehicle may include any type of sensor or sensors, such as imaging sensors or radar sensors or lidar sensors or ladar sensors or ultrasonic sensors or the like. The imaging sensor or camera may capture image data for image processing and may comprise any suitable camera or sensing device, such as, for example, a two dimensional array of a plurality of photosensor elements arranged in at least 640 columns and 480 rows (at least a 640×480 imaging array, such as a megapixel imaging array or the like), with a respective lens focusing images onto respective portions of the array. The photosensor array may comprise a plurality of photosensor elements arranged in a photosensor array having rows and columns. Preferably, the imaging array has at least 300,000 photosensor elements or pixels, more preferably at least 500,000 photosensor elements or pixels and more preferably at least 1 million photosensor elements or pixels. The imaging array may capture color image data, such as via spectral filtering at the array, such as via an RGB (red, green and blue) filter or via a red/red complement filter or such as via an RCC (red, clear, clear) filter or the like. The logic and control circuit of the imaging sensor may function in any known manner, and the image processing and algorithmic processing may comprise any suitable means for processing the images and/or image data.
For example, the vision system and/or processing and/or camera and/or circuitry may utilize aspects described in U.S. Publication No. US-2014-0327774 and/or U.S. Pat. Nos. 8,694,224; 7,005,974; 5,760,962; 5,877,897; 5,796,094; 5,949,331; 6,302,545; 6,396,397; 6,498,620; 6,523,964; 6,611,202; 6,201,642; 6,690,268; 6,717,610; 6,757,109; 6,802,617; 6,806,452; 6,822,563; 6,891,563; 6,946,978; 7,859,565; 5,550,677; 5,670,935; 7,881,496; 7,720,580; 7,038,577; 6,882,287; 5,929,786 and/or 5,786,772, and/or International Publication Nos. WO 2011/028686; WO 2010/099416; WO 2012/061567; WO 2012/068331; WO 2012/075250; WO 2012/103193; WO 2012/0116043; WO 2012/0145313; WO 2012/0145501; WO 2012/145818; WO 2012/145822; WO 2012/158167; WO 2012/075250; WO 2012/0116043; WO 2012/0145501; WO 2012/154919; WO 2013/019707; WO 2013/016409; WO 2013/019795; WO 2013/067083; WO 2013/070539; WO 2013/043661; WO 2013/048994; WO 2013/063014, WO 2013/081984; WO 2013/081985; WO 2013/074604; WO 2013/086249; WO 2013/103548; WO 2013/109869; WO 2013/123161; WO 2013/126715; WO 2013/043661; WO 2013/158592 and/or WO 2014/204794, which are all hereby incorporated herein by reference in their entireties. The system may communicate with other communication systems via any suitable means, such as by utilizing aspects of the systems described in International Publication Nos. WO/2010/144900; WO 2013/043661 and/or WO 2013/081985, and/or U.S. Publication No. US-2012-0062743, which are hereby incorporated herein by reference in their entireties.
Optionally, the vision system may include a display for displaying images captured by one or more of the imaging sensors for viewing by the driver of the vehicle while the driver is normally operating the vehicle. Optionally, for example, the vision system may include a video display device disposed at or in the interior rearview mirror assembly of the vehicle, such as by utilizing aspects of the video mirror display systems described in U.S. Pat. No. 6,690,268 and/or U.S. Publication No. US-2012-0162427, which are hereby incorporated herein by reference in their entireties. The video mirror display may comprise any suitable devices and systems and optionally may utilize aspects of the compass display systems described in U.S. Pat. Nos. 7,370,983; 7,329,013; 7,308,341; 7,289,037; 7,249,860; 7,004,593; 4,546,551; 5,699,044; 4,953,305; 5,576,687; 5,632,092; 5,677,851; 5,708,410; 5,737,226; 5,802,727; 5,878,370; 6,087,953; 6,173,508; 6,222,460; 6,513,252 and/or 6,642,851, and/or European patent application, published Oct. 11, 2000 under Publication No. EP 0 1043566, and/or U.S. Publication No. US-2006-0061008, which are all hereby incorporated herein by reference in their entireties. Optionally, the video mirror display screen or device may be operable to display images captured by a rearward viewing camera of the vehicle during a reversing maneuver of the vehicle (such as responsive to the vehicle gear actuator being placed in a reverse gear position or the like) to assist the driver in backing up the vehicle, and optionally may be operable to display the compass heading or directional heading character or icon when the vehicle is not undertaking a reversing maneuver, such as when the vehicle is being driven in a forward direction along a road (such as by utilizing aspects of the display system described in International Publication No. WO 2012/051500, which is hereby incorporated herein by reference in its entirety).
Optionally, the vision system (utilizing the forward facing camera and a rearward facing camera and other cameras disposed at the vehicle with exterior fields of view) may be part of or may provide a display of a top-down view or birds-eye view system of the vehicle or a surround view at the vehicle, such as by utilizing aspects of the vision systems described in International Publication Nos. WO 2010/099416; WO 2011/028686; WO 2012/075250; WO 2013/019795; WO 2012/075250; WO 2012/145822; WO 2013/081985; WO 2013/086249 and/or WO 2013/109869, and/or U.S. Publication No. US-2012-0162427, which are hereby incorporated herein by reference in their entireties.
Changes and modifications in the specifically described embodiments can be carried out without departing from the principles of the invention, which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents.

Claims (15)

The invention claimed is:
1. A vision system for a vehicle, said vision system comprising:
a plurality of cameras disposed at a vehicle and having a field of view exterior of the vehicle;
a video display device disposed in the vehicle and operable to display video images for viewing by a driver of the vehicle;
wherein each camera of said plurality of cameras captures respective image data;
wherein said plurality of cameras comprises a master camera and at least one slave camera;
wherein said at least one slave camera comprises an encryptor that encrypts the respective image data that is captured by said at least one slave camera;
wherein said at least one slave camera communicates to said master camera the encrypted image data captured and encrypted by the respective slave camera;
wherein said master camera comprises a respective decryptor for each slave camera of the at least one slave camera that decrypts the encrypted image data received from the respective slave camera to derive decrypted image data from the encrypted image data received from the respective slave camera;
wherein image data captured by said master camera is unencrypted;
wherein said master camera comprises a view generator operable to generate video images for display by said video display device;
wherein said view generator of said master camera receives unencrypted image data captured by said master camera and receives said decrypted image data derived from image data captured by said at least one slave camera; and
wherein video images generated by said view generator are derived from both (i) unencrypted image data captured by said master camera and (ii) said decrypted image data derived from image data captured by said at least one slave camera.
2. The vision system of claim 1, wherein said master camera comprises an image signal processor for processing image data captured by at least said master camera.
3. The vision system of claim 1, wherein said at least one slave camera includes an image signal processor for processing image data captured by said at least one slave camera before communicating the image data to said master camera.
4. The vision system of claim 1, wherein the captured and encrypted image data is communicated from said at least one slave camera to said master camera via an Ethernet communication.
5. The vision system of claim 1, wherein video images generated by said view generator of said master camera are communicated to said video display device via an Ethernet communication.
6. The vision system of claim 1, wherein said at least one slave camera comprises at least three slave cameras.
7. The vision system of claim 6, wherein said master camera and said at least three slave cameras combine to have a field of view around the vehicle.
8. The vision system of claim 7, wherein said view generator generates surround view video images that are derived from image data captured by said master camera and from image data received from said at least three slave cameras.
9. The vision system of claim 6, wherein said master camera comprises a plurality of decryptors that each decrypts the encrypted image data received from a respective one of said slave cameras.
10. A vision system for a vehicle, said vision system comprising:
a plurality of cameras disposed at a vehicle and having a field of view exterior of the vehicle;
a video display device disposed in the vehicle and operable to display video images for viewing by a driver of the vehicle;
wherein each camera of said plurality of cameras captures respective image data;
wherein said plurality of cameras comprises a master camera and at least three slave cameras;
wherein each of said slave cameras comprises an encryptor that encrypts the respective image data that is communicated by each of said slave cameras;
wherein said slave cameras communicate to said master camera the encrypted image data captured and encrypted by the respective slave cameras;
wherein said master camera comprises an image signal processor for processing image data captured by at least said master camera;
wherein each of said slave cameras includes an image signal processor for processing image data captured by the respective slave camera before communicating the respective image data to said master camera;
wherein said master camera comprises a respective decryptor for each of the three slave cameras that decrypts the encrypted image data received from the respective slave camera to derive decrypted image data from the encrypted image data received from the respective slave camera;
wherein image data captured by said master camera is unencrypted;
wherein said master camera comprises a view generator operable to generate video images for display by said video display device;
wherein said view generator of said master camera receives unencrypted image data captured by said master camera and receives said decrypted image data derived from image data captured by said slave cameras; and
wherein video images generated by said view generator are derived from both (i) unencrypted image data captured by said master camera and (ii) said decrypted image data derived from image data captured by said slave cameras.
11. The vision system of claim 10, wherein the captured and encrypted image data is communicated from said slave cameras to said master camera via Ethernet communications.
12. The vision system of claim 10, wherein video images generated by said view generator of said master camera are communicated to said video display device via an Ethernet communication.
13. The vision system of claim 10, wherein said master camera and said at least three slave cameras combine to have a field of view around the vehicle, and wherein said view generator generates surround view video images that are derived from image data captured by said master camera and from image data received from said at least three slave cameras.
14. A vision system for a vehicle, said vision system comprising:
a plurality of cameras disposed at a vehicle and having a field of view exterior of the vehicle;
a video display device disposed in the vehicle and operable to display video images for viewing by a driver of the vehicle;
wherein each camera of said plurality of cameras captures respective image data;
wherein said plurality of cameras comprises a master camera and at least three slave cameras;
wherein said master camera and said at least three slave cameras combine to have a field of view around the vehicle;
wherein said slave cameras communicate to said master camera the respective image data captured by the respective slave cameras;
wherein said master camera comprises an image signal processor for processing image data captured by at least said master camera;
wherein each of said slave cameras includes an image signal processor for processing image data captured by the respective slave camera before communicating the respective image data to said master camera;
wherein each of said slave cameras comprises an encryptor that encrypts the respective image data that is communicated by said slave cameras, and wherein said master camera comprises a respective decryptor for each slave camera of the three slave cameras that decrypts the encrypted communicated image data received from the respective slave camera to derive decrypted image data from the encrypted communicated image data received from the respective slave camera;
wherein image data captured by said master camera is unencrypted;
wherein said master camera comprises a view generator operable to generate video images for display by said video display device;
wherein said view generator of said master camera receives unencrypted image data captured by said master camera and receives said decrypted image data derived from image data captured by said slave cameras;
wherein video images generated by said view generator are derived from both (i) unencrypted image data captured by said master camera and (ii) said decrypted image data derived from image data captured by said slave cameras; and
wherein said view generator generates surround view video images that are derived from image data captured by said master camera and from image data received from said at least three slave cameras.
15. The vision system of claim 14, wherein the respective image data captured by the slave cameras is communicated from each of said slave cameras to said master camera via a respective Ethernet communication, and wherein video images generated by said view generator of said master camera are communicated to said video display device via an Ethernet communication.
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